Eissa Saad, Mourad Ali, and Mostafa Kamel Omaima. “Childhood-Onset Fluency Disorder (Stuttering): An Interruption in The Flow of Speaking”. Psycho-Educational Research Reviews, vol. 8, no. 3, Dec. 2019, pp. 11-13, https://www.perrjournal.com/index.php/perrjournal/article/view/150.